UN/NA Number Reference
DOT Class 2.2 Non-Flammable Gas placard

UN 1072: Oxygen, compressed

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1072 is assigned the proper shipping name Oxygen, compressed in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 2.2 Non-Flammable Gas material. Required label(s): 2.2, 5.1.

Packing group indicates the degree of danger within a hazard class: PG I is high danger, PG II medium, PG III low. The proper shipping name, hazard class, UN number, and packing group together form the basic shipping description that must appear on shipping papers and, where required, on the package and placard.

Emergency Response (ERG Guide 122)

Hazards: Oxidizer. Vigorously accelerates combustion. May cause fire or explosion on contact with fuels.

Fire: Use water only. Do not use dry chemical or CO2. Cool containers with flooding water.

Spill: Stop leak if safe. Do not touch. Keep combustibles away.

Chemical and Physical Properties

Oxygen is a colorless, odorless and tasteless gas. It will support life. It is noncombustible, but will actively support the burning of combustible materials. Some materials that will not burn in air will burn in oxygen. Materials that burn in air will burn more vigorously in oxygen. As a non-liquid gas it is shipped at pressures of 2000 psig or above. Pure oxygen is nonflammable. Under prolonged exposure to fire or intense heat the containers may rupture violently and rocket. Oxygen is used in the production of synthesis gas from coal, for resuscitation and as an inhalant.

CAS Number: 7782-44-7
Molecular Formula: O2
Molecular Weight: 31.999 g/mol
Color / Form: Colorless gas
Odor: Odorless
Boiling Point: -297.3 F
Melting Point: -361 °F (USCG, 1999)
Specific Gravity: 1.14 at -297.4 F
Vapor Pressure: 1 kPa at -211.9 C
Vapor Density: 1.43 (heavier than air)
Water Solubility: 39mg/L
Log P: 0.65

Special Provisions

49 CFR 172.102 special provision codes for this entry: 110, A14. These codes modify the general requirements (packaging, quantity limits, exceptions) for this specific material. Look up each code in 49 CFR 172.102 for the full text.

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Reference data compiled from the DOT Hazardous Materials Table (49 CFR 172.101), the 2024 Emergency Response Guidebook, and public chemical databases (PubChem, NIOSH, EPA). Always verify the correct shipping description against the current regulation and the manufacturer's SDS Section 14 before shipping.